Dr. A.K. Bag (b.1937) an M.Sc. in Pure Mathematics and Ph.D. in History of Mathematics, both from the University of Calcutta, served for seven years (1971-77) as lecturer of mathematics in the Surendranath College, Kolkata, and twenty-three years (1977-2000) as Co-ordinator and Head of History of Science Programme in the Indian National Science Academy, New Delhi. He is the author / editor of a large numer of books and research articles. Some of his books are: Bibliography of Sanskrit Works in Astronomy and Mathematics (with S.N. Sen and S.R. Sarma), Mathematics in Ancient and Medieval India, Science and Civilisation in India (Harappan Period), Sulbasutras (ed. & tr. with S.N. Sen), History of Oriental Astronomy (ed. with G. Swarup and K.S. Shukla), Indian and Central Asian Science and Technology (two volumes ed.), History of Technology in India (Vol. I, ed.). Elected Member of the International Academy of History of Science, Paris. He is presently the Editor, Indian Journal of History of Science and Adviser to the History of Science Programme of the Academy. Dr. S.R. Sarma (b. 1937) studied at Sir C.R. Reddy College, Eluru; Visva Bharati, Santiniketan; and Philipps University, Marburg, Germany. Joined the faculty of Aligarh Muslim University in 1969 and retired from there as Professor and Chairman of the Department of Sanskrit in 1997.
Fellow of the German Academic Exchange Service, twice at the Philipps University, Marburg, (1962-66; 1972) and once at Johann Wolfgang Goethe University, Frankfurt, (1995-96); Visiting Associate Professor of History of Mathematics at Brown University, Providence (1992-93); and Visiting Professor at the Universite de Paris III (1994). His publications include critical editions with translation of Thakkura Pheru's Rayanaparikkha on gemmology, and Yantraprakara of Sawai Jai Singh on astronomical instruments. Presently engaged in preparing A Descriptive Catalogue of Indian Astronomical and Time-Measurin